I'll keep this brief as I really need to get back to playing this amazing game.
The game basically replicated driving your cars round a track by cleverly utilising multiple die to represent your gearbox (die 1 to 6) and random elements such as damage, weather (yes weather!) etc.
It appears a complicated idea but it's actually very simple. You move up and down the gears but if you're in too high a gear coming into a sharp corner (they're graded depending how sharp they are) you can damage your tyres, spin, or even worse; crash out and end the game. 1st gear is a dice with only 1 & 2 on it - so you can only move 2 squares at max. Once you're up to dice 6 you move between 21 and 30! so as you can image - when the minimum you'll move is 21 spaces it's pretty nerve wracking to throw the higher dice and see if you'll make the corner.
That gives the strategy of being a slower but safer driver or going hell-for-leather and keeping your fingers crossed.
All in all it's a great game but also a quite amazing testament to how clever some people are to even think an idea like this up! And make it work!